See Ken Peavey's comment. IT IS THE TRUTH!!!
Florida Betony is no one's friend, even tho potentially an edible, until the apocalypse (Heaven forbid!). NO ANIMALS CHOOSE TO FORAGE IT!!!
I'm in GA zone 7b and it is relentless. Of all the methods in Ken's comments, only the sifting of garden bed soil for plants, roots, and tubers, even begins to give relief. And that will need to be redone, but looks like it might actually work if repeated to elimination. (I've been doing it!)
Pulling plants leaves tubers and roots, so just makes you feel better. If you only have a few, DO IT! If you're covered up with it, not a solution. We even solarized the garden, which was a temporary, falsely promising solution. Once the fall growth spurt came, it was a Florida Betony field day all over again. Alas.
Conclusion: DO NOT INTENTIONALLY PLANT FLORIDA BETONY !!! You WILL be sorry.
